Significant Accounting Policies - Schedule of Concentration of Credit Risk Percentage (Detail) (Customer Concentration Risk [Member])	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2013 Accounts receivable [Member] Customer A [Member]	Dec. 31, 2012 Accounts receivable [Member] Customer A [Member]	Sep. 30, 2013 Accounts receivable [Member] Customer B [Member]	Dec. 31, 2012 Accounts receivable [Member] Customer B [Member]	Sep. 30, 2013 Accounts receivable [Member] Customer C [Member]	Dec. 31, 2012 Accounts receivable [Member] Customer C [Member]	Sep. 30, 2013 Accounts receivable [Member] Customer D [Member]	Dec. 31, 2012 Accounts receivable [Member] Customer D [Member]	Sep. 30, 2013 Accounts receivable [Member] Customer E [Member]	Dec. 31, 2012 Accounts receivable [Member] Customer E [Member]	Sep. 30, 2013 Sales Revenue, Net [Member] Customer A [Member]	Sep. 30, 2012 Sales Revenue, Net [Member] Customer A [Member]	Sep. 30, 2013 Sales Revenue, Net [Member] Customer A [Member]	Sep. 30, 2012 Sales Revenue, Net [Member] Customer A [Member]	Sep. 30, 2013 Sales Revenue, Net [Member] Customer B [Member]	Sep. 30, 2012 Sales Revenue, Net [Member] Customer B [Member]	Sep. 30, 2013 Sales Revenue, Net [Member] Customer B [Member]	Sep. 30, 2012 Sales Revenue, Net [Member] Customer B [Member]	Sep. 30, 2013 Sales Revenue, Net [Member] Customer C [Member]	Sep. 30, 2012 Sales Revenue, Net [Member] Customer C [Member]	Sep. 30, 2013 Sales Revenue, Net [Member] Customer C [Member]	Sep. 30, 2012 Sales Revenue, Net [Member] Customer C [Member]	Sep. 30, 2013 Sales Revenue, Net [Member] Customer D [Member]	Sep. 30, 2012 Sales Revenue, Net [Member] Customer D [Member]	Sep. 30, 2013 Sales Revenue, Net [Member] Customer D [Member]	Sep. 30, 2012 Sales Revenue, Net [Member] Customer D [Member]	Sep. 30, 2013 Sales Revenue, Net [Member] Customer E [Member]	Sep. 30, 2012 Sales Revenue, Net [Member] Customer E [Member]	Sep. 30, 2013 Sales Revenue, Net [Member] Customer E [Member]	Sep. 30, 2012 Sales Revenue, Net [Member] Customer E [Member]	Sep. 30, 2013 Sales Revenue, Net [Member] Customer F [Member]	Sep. 30, 2012 Sales Revenue, Net [Member] Customer F [Member]	Sep. 30, 2013 Sales Revenue, Net [Member] Customer F [Member]	Sep. 30, 2012 Sales Revenue, Net [Member] Customer F [Member]
Concentration Risk [Line Items]
Customers accounted for percentage of company's total revenues and accounts receivable		33.00%		17.00%	22.00%	11.00%		11.00%	37.00%		18.00%	35.00%	39.00%	36.00%	17.00%					16.00%		14.00%		13.00%						11.00%	10.00%	12.00%